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Plant Physiology 71:451-455 (1983)
© 1983 American Society of Plant Biologists

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Articles

Light and Stomatal Metabolism 1

I. Possible Involvement of Light Modulation of Enzymes in Stomatal Movement

I. Madhusudana Rao2 and Louise E. Anderson3

Department of Biological Sciences, University of Illinois at Chicago, Chicago, Illinois 60680

New evidence is provided regarding the direct effect of light on stomatal opening in the epidermis of the pea (Pisum sativum L. var Little Marvel) leaf. Light modulates the activity of a number of key enzymes involved in stomatal metabolism. When isolated epidermal strips are illuminated, phosphoenolpyruvate carboxylase, NADP-malate dehydrogenase, and NADP-isocitrate dehydrogenase are activated; and aspartate aminotransferase is inactivated. Sulfhydryl compounds, dithiothreitol and glutathione, enhance stomatal opening in epidermal strips both in light or darkness while the sulfhydryl reagent N-ethylmaleimide inhibits, indicating the possible involvement of sulfhydryl groups in stomatal movements. Further, light treatment increases measureable thiol levels in the epidermis about 3-fold. These results suggest that light modulation of enzymes in the epidermis may play a significant role in the mechanism of stomatal movement.

2 Present address: Department of Botany, University of Illinois at Urbana-Champaign, Urbana, IL 61801.

3 Address reprint requests to this author.

1 Supported by Department of Energy Contract EP 78-S-02 1961.






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Copyright © 1983 by the American Society of Plant Biologists